What Is the Role of Point D in a Body Diagram and Moment Equilibrium?

AI Thread Summary
The discussion focuses on understanding the role of point D in a body diagram related to moment equilibrium. Participants identify point D as a roller that allows for movement and expansion of the structure, which hinges at point A. There is uncertainty about whether a force should be present at point D, with a consensus leaning towards assuming no force exists there. Some suggest that point D might function as a pulley instead of a bridge. Overall, the emphasis is on clarifying the mechanics of point D in the context of equilibrium and structural support.
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Homework Statement



Untitled_zpseabfa304.png


Homework Equations



M=FA

Equlibrium condition=
net Fy=0
net Fx = 0
Total Moment=0


The Attempt at a Solution


I need help with the body diagrem

The D circle thing is what? is that a roller?
 
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Yes, I also think so. The structure hinges at A and in order to compensate for its expansion it can roll over the supporting surface at D. The cable is there to raise it.
 
photo1_zps28ed9b30.jpg


Did i draw correctly?
 
It seems so,yes. I am also not sure if there should be a force at D since it seems you would not be able to solve it if there is a force present at that point.
 
I think you should assume there is no force at D. Maybe it is not a bridge and it is a pulley at end D.
 
Basic_Physics said:
I think you should assume there is no force at D. Maybe it is not a bridge and it is a pulley at end D.
That is how I see it also. No support at D.
 

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